Bump docker/metadata-action from 4.3.0 to 4.6.0

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 4.3.0 to 4.6.0.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](docker/metadata-action@507c2f2...818d4b7)

---
updated-dependencies:
- dependency-name: docker/metadata-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/docker.yml

@@ -77,7 +77,7 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@507c2f2dc502c992ad446e3d7a5dfbe311567a96
+        uses: docker/metadata-action@818d4b7b91585d195f67373fd9cb0332e31a7175
         with:
           images: |
             ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-alpine_${{ matrix.alpine_version }}
@@ -122,7 +122,7 @@ jobs:
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@507c2f2dc502c992ad446e3d7a5dfbe311567a96
+        uses: docker/metadata-action@818d4b7b91585d195f67373fd9cb0332e31a7175
         with:
           images: |
             ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-alpine_${{ matrix.alpine_version }}